CA2133122A1 - Switch operator and interlock mechanism - Google Patents
Switch operator and interlock mechanismInfo
- Publication number
- CA2133122A1 CA2133122A1 CA002133122A CA2133122A CA2133122A1 CA 2133122 A1 CA2133122 A1 CA 2133122A1 CA 002133122 A CA002133122 A CA 002133122A CA 2133122 A CA2133122 A CA 2133122A CA 2133122 A1 CA2133122 A1 CA 2133122A1
- Authority
- CA
- Canada
- Prior art keywords
- switch
- actuator
- door
- cam
- interlock
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H3/00—Mechanisms for operating contacts
- H01H3/32—Driving mechanisms, i.e. for transmitting driving force to the contacts
- H01H3/38—Driving mechanisms, i.e. for transmitting driving force to the contacts using spring or other flexible shaft coupling
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/02—Details
- H01H33/46—Interlocking mechanisms
- H01H33/48—Interlocking mechanisms for interlocking between casing or cover and mechanism for operating contacts
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/02—Details
- H01H33/46—Interlocking mechanisms
- H01H33/52—Interlocking mechanisms for interlocking two or more switches
Landscapes
- Push-Button Switches (AREA)
Abstract
Switch operator having an actuator, a drive mechanism coupled to the switch for actuating a switch in response to a rotational force applied to the drive mechanism, and a flexible shaft which couples the actuator to the drive mechanism and communicates the rotational motion of the actuator to the drive mechanism. An interlock mechanism prevents the actuation of a second switch as a function of a first switch and prevents the opening of a door as a function of the position of the first switch.
Description
21:33122 .
FIELD OF THE INVENTION
The present invention is related generally to electrical switch gear and more particularly, to a switch 5 operator for actuating a switch disposed in an electrical switch gear cabinet and to a sw~tch interlock mechanism that meets safety locking requirements.
BACKGROUND OF T~E INVENTION
Switch operators are used to provide actuation of switches located in the housing of primary entrance units or electrical switch gear cabinets. The actuators of switch operators are commonly located on the outside of the housing of electrical switch gear cabinets. The switches themselves are mounted somewhere inside the cabin~t. The actuators typically include a handle to facilitate their movement. Because of the relative locations of the switch actuators and the switches they control, some mechanism must be provided for coupling the movement of each actuator to its respective switch.
Previously, switch operators have employed chain drive 20 mechanisms to transfer the motion of an actuator to its respective switch. Other switch operators have employed shafts with universal joints to provide the coupling of an actuator to its respective switch The assem~ly of such coupling devices is complicated and time consuming. For e~ample, to assemble a co~pling device comprised of a chain drive mechanism, the chain generally must be cut to length, connected and then aligned.
Consequently, there is a need for a switch operator that is simple, inexpensive and easy to install.
Interlock mechznisms are used to limit the operation 5 of switch operators to meet safety locking requirements.
Previously, interlock mechanisms have employed a Kirk lock to meet the safety locking requirements. A Kirk lock is a locking mechanism that prevents switch actuat-on unless a corresponding key is inserted in the Kirk lock. After the key is inserted, 10 a user may actuate a switch. Ideally, the key should be kept at a separate and controlled location frcm the switch operator.
The Kirk lock provides only a minimum level of safety protection for the user of the switch operator. In addition, if the key is lost or misplaced, a user may not be able to 15 actuate a switch when required. Accordingly there is need for an interlock mechanism that provides the safety locking requirements without the use of a Kirk lock.
The present invention satisfies these needs.
~UMMARY OF THE INVENTION
The present invention is directed to a switch operator which, in part, uses a flexible shaft to actuate a switch thereby reducing the complexity and time of assembly of the switch operator. The present invention is also directed to an interlock mechanism that preven-s closure of a switch as a function of the position of a door, prevents opening of the door as a function of a position of the switch, and prevents actuation of a second switch as a function of the position of the first switch.
According to one aspect of the invention, a switch 30 operator of the present invention includes an actuator and a drive mechanism coupled to the sw tch for actuating the switch in response to a rotational force applied to the drive mechanism. The switch operator also includes a flexible shaft which couples the actuator to the drive means and communicates 35 the rotational motion of the actua~or to the drive mechanism.
21~3122 According to another aspect of the invention, an electrical switch cabinet of the present invention has a first and second switch and a first and second switch operator. The first switch operator includes a first actuator and a first 5 drive mechanism coupled to the first switch for actuating the first switch in response to a rotational force applied to the first drive mechanism. Th~ first switch operator also includes a first flexible shaft which couples the first actuator to the first drive mechanism and communicates the rotational motion of the first actuator to the first drive mechanism. The second switch operator includes a second actuator and a second drive mechanism coupled to the second switch for actuating the second switch in response to a rotational force applied to the second drive mechanism. The second switch operator also includes a second flexible shaft which couples the second actuator to the second drive mechanism and communicates the rotational motion of the second actuator to the second drive mechanism.
According to a further aspect of this invention, the electrical switch cabinet also includes an interlock mechanism.
20 The interlock mechanism includes switch interlock means for preventing the actuation of the second switch as a function of the first switch.
According to a further aspect of this invention, the interlock mechanism of th~ electrical switch cabinet also includes prevention means for prevent~ng the opening of the door as a function of the position of the first swit~h.
According to a further aspect of this invention, the interlock mechanism of the electrical switch ca~inet also includes actuation means for preventing the actuation of the first switch as a function of the position of the door.
According to another aspect of the invention, an interlock mechanis~ for an eiectrical cabinet having first and second switches and a door, includes switch interlock means for preventing the actuation of the second switch as a function of the first switch and preventior. means for preventing the opening of the door as a function of the position of the first switch.
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213~122 According to a further aspect of the invention, the interlock mechanism also includes actuation means for preventing the actuation of the first switch as a function of the position of the door~
Figure l is a diagram of an exemplary electrical switch gear cabinet depicting an exemplary configuration of switch operators and an interlock mechanism in accordance with a preferred embodiment of the invention.
Figure 2 is a side view of an exemplary drive mechanism of the switch operators of Figure 1.
Figure 3 is a top view of the exemplary drive mechanism shown in Figure 2.
Figure 4 is a diagram illustrating further details of the interlock mechanism of Figure l.
Figure 5 is a diagram or an exemplary configuration of a plunger of the exemp ar~ interlock mechanism of Figure l.
Figure 6 i.lustrates the operation of the inte,lock mechanism of Figure 4 when the actuator for the top switch 20 operator is in the position corresponding to the open position for the switch.
Figure 7 illustrates the operation of the interlock mechanism of Figure 4 when the actuator for the top switch operator is in the position correspcr.ding to the closed 25 position for the switch.
Figure 8 is a diagram of an exemplary configuration of a hasp for the door or the electrical switch cabinet of Figure 1.
. .
2133~22 DETAILED DESCRIPTION OF PREFERRED EMBODIMENT~
Referring to the drawings wherein like numerals indicate like elements throughout, there is shown in Figure 1 an exemplary electrical switch cabinet or primary entrance unit embodying exemplary switch operators and an exemplary interlock mechanism of this invention. A brief overview of the invention is presented by reference to this exemplary cabinet lo. The exemplary cabinet 10 includes a door 60, two exemplary switch operators 82 and 89 which actuate switch 50 and switch 40, respectively, and an interlock mechanism 20.
In the exemplary cabinet 10 shown in Figure 1, the switch 50 is an interrupter switch used to connect or disconnect a load (not shown) from a source of power. Switch 40 is a line selector switch used to select the source of power supplied to the switch 50 and subsequently the load. The switch 50 is actuated by the switch operator 82 in order to open and close the switch. Similarly, the switch 40 is actuated by the switch operator 89 in order to switch the source of power from one line to another.
In addition, in the exemplary cabinet 10: (i) the actuation of switch 40 is limited as a function of the position of switch 50, i.e., whether opened or closed; (ii) the actuation of switch 50 is limited as a function of whether the door 60 is opened or closed; and, (~ the operation of the 25 door 60 is limited as a function of the position of switch 50.
According to the present invention, each switch operator 82 or 89 as shown in Figure 1, comprises an actuator 22 or 29, a flexible shaft 32 or 39, and a drive mechanism 30.
The actuators 22 and 29 are coupled to the respective flexible shafts 32 and 39. The flexible shafts 32 and 39 are, in turn, coupled to the respective drive mechanisms 30. The drive mechanisms 30 are coupled to the switches 40 and 50.
Considering the operation of switch operator 82 in greater detail, when a rotational fvrce is applied to the actuator 22 by its handle 90, a rotational force is applied (assuming the interlock mechanism 20 is not preventing movement of the actuator 22, as described hereina~ter) to shaft 32 which, in , A~PD-0002/B930040 - 6 - PATEN~
turn, communicates that force to its respective drive mechanism 30. The drive mechanism 30, in turn, applies the rotational force to the switch 50 to actuate the switch 50. Switch operator 89 operates in the same manner to actuate switch 40.
In the exemplary cabinet 10, actuation of switch 50 is used to connect or disconnect the source of power to the load, and switch 40 is used to select the source of power. Switch 50 is commonly referred to in the art as an interrupter switch, and switch 40 is commonly referred to as a line selector switch.
In the preferred embodiment of the invention, the flexible shafts 32 and 39 are formed of a metal, such as steel.
Each shaft 32 or 39, while flexible, is sufficiently rigid to communicate a rotational force applied to one end of the shaft to the other end of the shaft.
As shown in Figures 2 and 3, in the preferred embodiment, each drive mechanism 30 comprises a bevel gear drive 30. The bevel gear drive 30 includes an actuator pinion 33 and an actuator gear 34. The actuator pinion 33 is connected to a respective flexible shaft 32 or 39 and is 20 matingly engaged to the actuator gear 34 so that when a rotational force is applied to the flexible shaft 32 or 39, the actuator pinion 33 will apply a rotational force to the actuator gear 34. In the preferred embodiment, the rotational force applied to the actuator gear is transverse to the 25 direction of the rotational force applied to the flexible shaft 32 or 39 and actuator pinion 33. In the preferred embodiment, the actuator gear 34 is mounted on a support mount 35 and connected to the switch 50 or switch 40 so that when the actuator pinion 33 applies rotational force, the actuator gear 34 actuates the respective switch 5d or 40.
Considering the assembly of switch operator 82 in greater detail, the drive me~hanism 30 must be connected to the switch 50, and the actuator 22 must be mounted on the housing of cabinet 10. The flexi~le shaft 32 is coupled at one end to 35 the actuator 22 and at the other end to the drive mechanism 30.
During assembly, the flex~ble shaft 32 may first need to be cut to the appropriate length, i.e., to a length that reaches from 2133122`
A~PD-0002/B930040 - 7 - PATEN~
the actuator 22 to the corresponding drive mechanism 30. One or both ends of the flexible shaft 32 may also need to be fitted with interface devices (not shown) to facilitate coupling to the actuator 22 and the drive mechanism 30. Switch 5 operator 89 is assembled in a similar manner. Overall, assembly of a switch operator of the present invention is less complicated and time consuming than the assembly of switch operators employing a chain drive or universal joints as described in the background of the invention. This is due to 10 the employment of the flexible shaft in the switch operator of the present invention. In particular, to assemble a switch operator of the present invention, the flexible shaft (cut to an appropriate length) need only be connected to the actuator and the drive mechanism of the switch operator.
As noted above, the present invention further comprises an interlock mechanism 20 for use in the exemplary cabinet 10 that: (i) prevents closure of the switch 50 if the door 60 of the cabinet 10 is open; (ii) prevents opening of the door 60 of the cabinet 10 if the switch 50 is closed; and, (iii) prevents actuation of the switch 40 if the switch 50 is closed. The interlock mechanism 20 of the present invention comprises a plunger mechanism 71 (shown in Figures 4 and 6), an actuator interlock 21 (shown in Figures 5-7), and a hook mechanism 25 (shown in Figures 6 and 7).
In the preferred embodiment, the plunger mechanism 71 of the interlock mechanism 20 is used to prevent the closure of a switch (in the exemplary emhodiment, switch 50) if the door 60 of the cabinet 10 is open. The operation and configuration of this aspect of the interlock mechanism 20 is described with 30 reference to Figures 4 and 6. In particular, this aspect or interlocking feature of the invention uses the plunger 71 and a slotted cam 23 coupled to the actuator 22 of the switch 50.
The plunger 71 engages a slot 24 of the cam 23 when door 60 is open and the switch 50 is also open, thus preventing the 35 rotation of the actuator 22. As a ccnsequence, the switch 50 cannot be closed when the door 60 is open. In the preferred embodiment of the invention, when the door 60 of the cabinet 10 21331'~2 is closed, the plunger 71 is depressed by the door 60 and disengaged from the slot 24 of the cam 23 thus allowing actuation of the switch So. Figures 4 and 6 show a preferred configuration of the plunger 71 and cam 23.
S In particular, as shown in Figure 4, the plunger 71 is mounted in the interlock mechanism 20 and rests against a support 76 of the mechanism 20. The plunger 71 is coupled to a plunger spring 72, a washer 73, and ~ spring pin 74. In the preferred embodiment, the plunger spring 72, washer 73, and 10 spring pin 74 are configured so that the rear extension of the plunger 71 facing into the cabinet lO rests against the support 76 unless pressure is applied against the front extension 75 of the plunger 71.
As best shown in Figure 4, if pressure is applied to 15 the front extension 75 of the plun~er 71 in a direction toward the rear of the cabinet 10, the plunger 71 will extend further to the rear of the cabinet and thus will not rest against the support 76 and will not engage the slot 24. When the door 60 of the cabinet is closed, the door applies such a pressure to 20 the front extension 75 of the plunger 71. If the door is open, however, the spring 72 will force the plunger 71 to rest against the support 76.
The plunger 71 is shown in Figure 6 in relation to the cam 23 of the actuator 22 of the switch 50. As shown, the cam 23 is directly coupled to the actuator 22 so that when the cam 23 is prevented from moving by the plunger 71 engaging the slot 24, the actuator 22 is also prevented from moving and thus the switch 50 is prevented from ~eing actuated. In Figure 6, the cam 23 and the actuator ^~2 are shown in the position 30 corresponding to the open posi.tion of the switch 50. When the door 60 is alsc open, the slot 24 of the cam 23 engages the rear extension of the plunger 71.
Referring again to Figure 4, in the preferred embodiment, the thickness of the cam 23 and configura'ion of 35 the rear extension cf the plunger 71 are selected so that when the door is closed the plunger 71 will not engage the slot 24 of the cam 23. Thus, when the door 60 is closed, the actuator A~PD-0002/B930040 -- 9 -- PATENT
22 may be rotated to close the switch 50. However, as explained above, the plunger 71 and the slot 24 in the cam 23 prevent closure of the switch 50 when the door 60 is open.
As noted above, the interlock mechanism 20 also 5 prevents the opening of the door 60 when the switch 50 is closed. In the preferred embodiment, a hooked cam 23 (Figure 7) and a hasp 61 on the door 60 (Figure 8) are used to prevent the opening of the door 60 when the switch 50 is closed. The operation and configuration of this aspect of the interlock 10 mechanism 20 is described with reference to Figures 5 to 8. In the preferred embodiment, a hook 25 in the cam 23 engages a slot 63 (Figure 8) of the hasp 61 of the door 60 when the switch 50 is closed, thus preventing the opening of the door 60. When the actuator 22 is moved to the position 15 corresponding to the open position of the switch 50, the hook 25 of the cam 23 disengagPs the slot 63 of the hasp 61 so that the door 60 may be opened. As shown in Figures 6 and 7, the hasp 61 of the door 60 enters the interlock mechanism 20 of the switch operator through a slot 26 in the mechanism 20. As 20 shown in Figure 8, the hasp 61 preferably has a rectangular slot 63 that the hook 25 of the cam 23 engages when the switch is closed. Thus, in the preferred embodiment, the door 60 of the cabinet 10 is prevented from being opened by the engagement of the hook 25 to the slot 63.
To summarize, during a cycle of opening and closing the switch 50, the components of the interlock mechanism 20, in particular, the plunger 71, the hook 25 and the slot 24 of the cam 23, and the hasp 61, interact to: (i) prevent closure of the switch 50 when the door 60 ~s open; and, (ii) prevent the 30 door 60 from being opened when the switch 50 is closed. For example, if the door 60 is closed and the switch 50 is closed, the hook 25 will engage the slot 63 of the hasp 61 and the front extension 75 of the plunger 71 will be depressed rearward so that the rear extension of the plunger 71 will not rest 35 against the support 76 and tnerefore will not engage the slot 24. In this situation, the door 60 is prevented from being opened, but the switch 5G can be actuated since the plunger 71 is not engaged with the slot 24. Thus, a clockwise rotational force may be applied by the handle 90 of the actuator 22, causing the switch 50 to be opened.
As the actuator 22 is being rotated clockwise, the 5 hook 25 will also be rotated clockwise and will reach a point where the switch 50 is open. At this point, the hook 25 will no longer engage the slot of the hasp 61 as shown in Figure 6.
As a consequence, at this point, the door 60 may be opened.
When the door 60 is opened, the rear extension of the plunger 10 71 will engage the slot 24 as shown in Figure 6. Thus, the door 60 and the switch 50 will be open. Due to the engagement of the rear extension of the plunger 71 with the slot 24, the actuator 22 will not be able to be rotated counterclockwise.
Thus, the switch 50 can not be closed when the door 60 is open.
15 The actuator 22 can only be rotated to the closed position when the door 60 of the cabinet 10 is closed. As explained above, when the door 60 is closed, the door 60 depresses the front extension 75 of the plunger 71 and disengages the rear extension of the plunger 71 with the slot 24. With the rear 20 extension of the plunger 71 disengaged with the slot 24, the actuator 22 may be rotated to close the switch 50.
Finally, in addition to the two functions described above, the interlock mechanism 20 also prevents the actuation of switch 40 when the switch 50 is closed. Such a function is 25 particularly useful in electrical switch gear, e.g., cabinet 10, that include both an interrupter switch and a line selector switch. However, this third function of the interlock mechanism 20 of the present invention may be used in any application in which it is desirable to control the actuation 30 of one switch depending upon the position, or state, of another switch. According to the preferred embodiment, the cam 23 and an actuator interlock (sliding plate) 21 are used to prevent the actuation of switch 40 when the switch 50 is closed. The operation and configuration of this aspect of the interlock 35 mechanism 20 are described with reference to Figures 5 to 7.
In the preferred embodiment, as shown in Figure 5, the cam 23 of the actuator 22 engages with an extension 33 of the sliding , 21~3122 A~PD-0002/B930040 - 11 - PATENT
plate or actuator interlock 21. When the switch 50 is closed, as shown in Figure 7, the cam 23 engages the extension 33 and causes an opening 28 of the actuator interlock 21 to engage the actuator 29. This engagement of the actuator 29 prevents its 5 rotation and consequently the actuation of the switch 40 when the switch 50 is closed.
In greater detail, when the switch 50 is closed, the cam 23 of the actuator 22 engages the extension 33 of the actuator interlock 21 which raises the position of the actuator interlock 21. This engagement causes the actuator interlock 21 to reach it highest position relative to the actuators 22 and 29. As show in Figure 6, in the preferred embodiment of the invention, the actuator interlock 21 is a sliding plate 21 which slides up and down on two slots 37 and 38 as a function 15 of the position of the cam 23. In the preferred embodiment, the interlock 21 inclu~es an opening 27 around the actuator 29 for the switch 40. Preferably, the shape of the opening 27 is such that when the interlock 21 is at its lowest point, as shown in Figure 6, (which point corresponds to the position of 20 the cam 23 when the switch 50 is open), the actuator 29 is in the circular portion of the opening 27 and thus the actuator 29 of the switch 40 may be rotated to actuate the switch 40. When the actuator interloc~ 21 is in its highest position, as shown in Figure 7, (which point corresponds to the position of the 25 cam 23 when the switch 50 is closed), the actuator 29 is in the square portion 28 of the opening 27 and thus the actuator 29 of the line selector switch 40 may not be rotated to actuate the switch 40. Thus, the actuator interlock 21 prevents the actuation of the switch 40 when the switch 50 is closed, but 30 permits the actuati.on of the switch 40 when the switch 50 is open.
As the foregoing illustrates, therefore, in the exemplary electrical cabinet 10, the interlock mechanism 20 of the present invention is employed to: (i) prevent closure of the switch 50 as a function of the position of the door 60;
(ii) prevent opening of the door 60 as a function of the A~PD-0002/B930040 - 12 - PATENT
position of the switch 50; and (iii) prevent actuation of the switch 40 as a function of the position of switch 50.
From the foregoing it can be seen that the present invention is directed first to a switch operator which uses a flexible shaft to overcome the disadvantages of known switch operators, and secondly, to an interlock mechanism that prevents the actuation of one or more switches in certain situations and also prevents the opening of a door based on the position of one or more of these switches. It is understood 10 that changes may be made to the embodiments described above without departing from the broad inventive concepts thereof.
For example, the switch operator and ~nterlock mechanism of the present invention may be employed in electrical cabinets that contain only one switch, or alterna~ively, in electrical 15 cabinets that contain more than two switches. Accordingly, this invention is not limited to the particular embodiments disclosed, but is intended to cover all modifications that are within the scope and spirit of the invention as defined by the appended claims.
FIELD OF THE INVENTION
The present invention is related generally to electrical switch gear and more particularly, to a switch 5 operator for actuating a switch disposed in an electrical switch gear cabinet and to a sw~tch interlock mechanism that meets safety locking requirements.
BACKGROUND OF T~E INVENTION
Switch operators are used to provide actuation of switches located in the housing of primary entrance units or electrical switch gear cabinets. The actuators of switch operators are commonly located on the outside of the housing of electrical switch gear cabinets. The switches themselves are mounted somewhere inside the cabin~t. The actuators typically include a handle to facilitate their movement. Because of the relative locations of the switch actuators and the switches they control, some mechanism must be provided for coupling the movement of each actuator to its respective switch.
Previously, switch operators have employed chain drive 20 mechanisms to transfer the motion of an actuator to its respective switch. Other switch operators have employed shafts with universal joints to provide the coupling of an actuator to its respective switch The assem~ly of such coupling devices is complicated and time consuming. For e~ample, to assemble a co~pling device comprised of a chain drive mechanism, the chain generally must be cut to length, connected and then aligned.
Consequently, there is a need for a switch operator that is simple, inexpensive and easy to install.
Interlock mechznisms are used to limit the operation 5 of switch operators to meet safety locking requirements.
Previously, interlock mechanisms have employed a Kirk lock to meet the safety locking requirements. A Kirk lock is a locking mechanism that prevents switch actuat-on unless a corresponding key is inserted in the Kirk lock. After the key is inserted, 10 a user may actuate a switch. Ideally, the key should be kept at a separate and controlled location frcm the switch operator.
The Kirk lock provides only a minimum level of safety protection for the user of the switch operator. In addition, if the key is lost or misplaced, a user may not be able to 15 actuate a switch when required. Accordingly there is need for an interlock mechanism that provides the safety locking requirements without the use of a Kirk lock.
The present invention satisfies these needs.
~UMMARY OF THE INVENTION
The present invention is directed to a switch operator which, in part, uses a flexible shaft to actuate a switch thereby reducing the complexity and time of assembly of the switch operator. The present invention is also directed to an interlock mechanism that preven-s closure of a switch as a function of the position of a door, prevents opening of the door as a function of a position of the switch, and prevents actuation of a second switch as a function of the position of the first switch.
According to one aspect of the invention, a switch 30 operator of the present invention includes an actuator and a drive mechanism coupled to the sw tch for actuating the switch in response to a rotational force applied to the drive mechanism. The switch operator also includes a flexible shaft which couples the actuator to the drive means and communicates 35 the rotational motion of the actua~or to the drive mechanism.
21~3122 According to another aspect of the invention, an electrical switch cabinet of the present invention has a first and second switch and a first and second switch operator. The first switch operator includes a first actuator and a first 5 drive mechanism coupled to the first switch for actuating the first switch in response to a rotational force applied to the first drive mechanism. Th~ first switch operator also includes a first flexible shaft which couples the first actuator to the first drive mechanism and communicates the rotational motion of the first actuator to the first drive mechanism. The second switch operator includes a second actuator and a second drive mechanism coupled to the second switch for actuating the second switch in response to a rotational force applied to the second drive mechanism. The second switch operator also includes a second flexible shaft which couples the second actuator to the second drive mechanism and communicates the rotational motion of the second actuator to the second drive mechanism.
According to a further aspect of this invention, the electrical switch cabinet also includes an interlock mechanism.
20 The interlock mechanism includes switch interlock means for preventing the actuation of the second switch as a function of the first switch.
According to a further aspect of this invention, the interlock mechanism of th~ electrical switch cabinet also includes prevention means for prevent~ng the opening of the door as a function of the position of the first swit~h.
According to a further aspect of this invention, the interlock mechanism of the electrical switch ca~inet also includes actuation means for preventing the actuation of the first switch as a function of the position of the door.
According to another aspect of the invention, an interlock mechanis~ for an eiectrical cabinet having first and second switches and a door, includes switch interlock means for preventing the actuation of the second switch as a function of the first switch and preventior. means for preventing the opening of the door as a function of the position of the first switch.
., ~
213~122 According to a further aspect of the invention, the interlock mechanism also includes actuation means for preventing the actuation of the first switch as a function of the position of the door~
Figure l is a diagram of an exemplary electrical switch gear cabinet depicting an exemplary configuration of switch operators and an interlock mechanism in accordance with a preferred embodiment of the invention.
Figure 2 is a side view of an exemplary drive mechanism of the switch operators of Figure 1.
Figure 3 is a top view of the exemplary drive mechanism shown in Figure 2.
Figure 4 is a diagram illustrating further details of the interlock mechanism of Figure l.
Figure 5 is a diagram or an exemplary configuration of a plunger of the exemp ar~ interlock mechanism of Figure l.
Figure 6 i.lustrates the operation of the inte,lock mechanism of Figure 4 when the actuator for the top switch 20 operator is in the position corresponding to the open position for the switch.
Figure 7 illustrates the operation of the interlock mechanism of Figure 4 when the actuator for the top switch operator is in the position correspcr.ding to the closed 25 position for the switch.
Figure 8 is a diagram of an exemplary configuration of a hasp for the door or the electrical switch cabinet of Figure 1.
. .
2133~22 DETAILED DESCRIPTION OF PREFERRED EMBODIMENT~
Referring to the drawings wherein like numerals indicate like elements throughout, there is shown in Figure 1 an exemplary electrical switch cabinet or primary entrance unit embodying exemplary switch operators and an exemplary interlock mechanism of this invention. A brief overview of the invention is presented by reference to this exemplary cabinet lo. The exemplary cabinet 10 includes a door 60, two exemplary switch operators 82 and 89 which actuate switch 50 and switch 40, respectively, and an interlock mechanism 20.
In the exemplary cabinet 10 shown in Figure 1, the switch 50 is an interrupter switch used to connect or disconnect a load (not shown) from a source of power. Switch 40 is a line selector switch used to select the source of power supplied to the switch 50 and subsequently the load. The switch 50 is actuated by the switch operator 82 in order to open and close the switch. Similarly, the switch 40 is actuated by the switch operator 89 in order to switch the source of power from one line to another.
In addition, in the exemplary cabinet 10: (i) the actuation of switch 40 is limited as a function of the position of switch 50, i.e., whether opened or closed; (ii) the actuation of switch 50 is limited as a function of whether the door 60 is opened or closed; and, (~ the operation of the 25 door 60 is limited as a function of the position of switch 50.
According to the present invention, each switch operator 82 or 89 as shown in Figure 1, comprises an actuator 22 or 29, a flexible shaft 32 or 39, and a drive mechanism 30.
The actuators 22 and 29 are coupled to the respective flexible shafts 32 and 39. The flexible shafts 32 and 39 are, in turn, coupled to the respective drive mechanisms 30. The drive mechanisms 30 are coupled to the switches 40 and 50.
Considering the operation of switch operator 82 in greater detail, when a rotational fvrce is applied to the actuator 22 by its handle 90, a rotational force is applied (assuming the interlock mechanism 20 is not preventing movement of the actuator 22, as described hereina~ter) to shaft 32 which, in , A~PD-0002/B930040 - 6 - PATEN~
turn, communicates that force to its respective drive mechanism 30. The drive mechanism 30, in turn, applies the rotational force to the switch 50 to actuate the switch 50. Switch operator 89 operates in the same manner to actuate switch 40.
In the exemplary cabinet 10, actuation of switch 50 is used to connect or disconnect the source of power to the load, and switch 40 is used to select the source of power. Switch 50 is commonly referred to in the art as an interrupter switch, and switch 40 is commonly referred to as a line selector switch.
In the preferred embodiment of the invention, the flexible shafts 32 and 39 are formed of a metal, such as steel.
Each shaft 32 or 39, while flexible, is sufficiently rigid to communicate a rotational force applied to one end of the shaft to the other end of the shaft.
As shown in Figures 2 and 3, in the preferred embodiment, each drive mechanism 30 comprises a bevel gear drive 30. The bevel gear drive 30 includes an actuator pinion 33 and an actuator gear 34. The actuator pinion 33 is connected to a respective flexible shaft 32 or 39 and is 20 matingly engaged to the actuator gear 34 so that when a rotational force is applied to the flexible shaft 32 or 39, the actuator pinion 33 will apply a rotational force to the actuator gear 34. In the preferred embodiment, the rotational force applied to the actuator gear is transverse to the 25 direction of the rotational force applied to the flexible shaft 32 or 39 and actuator pinion 33. In the preferred embodiment, the actuator gear 34 is mounted on a support mount 35 and connected to the switch 50 or switch 40 so that when the actuator pinion 33 applies rotational force, the actuator gear 34 actuates the respective switch 5d or 40.
Considering the assembly of switch operator 82 in greater detail, the drive me~hanism 30 must be connected to the switch 50, and the actuator 22 must be mounted on the housing of cabinet 10. The flexi~le shaft 32 is coupled at one end to 35 the actuator 22 and at the other end to the drive mechanism 30.
During assembly, the flex~ble shaft 32 may first need to be cut to the appropriate length, i.e., to a length that reaches from 2133122`
A~PD-0002/B930040 - 7 - PATEN~
the actuator 22 to the corresponding drive mechanism 30. One or both ends of the flexible shaft 32 may also need to be fitted with interface devices (not shown) to facilitate coupling to the actuator 22 and the drive mechanism 30. Switch 5 operator 89 is assembled in a similar manner. Overall, assembly of a switch operator of the present invention is less complicated and time consuming than the assembly of switch operators employing a chain drive or universal joints as described in the background of the invention. This is due to 10 the employment of the flexible shaft in the switch operator of the present invention. In particular, to assemble a switch operator of the present invention, the flexible shaft (cut to an appropriate length) need only be connected to the actuator and the drive mechanism of the switch operator.
As noted above, the present invention further comprises an interlock mechanism 20 for use in the exemplary cabinet 10 that: (i) prevents closure of the switch 50 if the door 60 of the cabinet 10 is open; (ii) prevents opening of the door 60 of the cabinet 10 if the switch 50 is closed; and, (iii) prevents actuation of the switch 40 if the switch 50 is closed. The interlock mechanism 20 of the present invention comprises a plunger mechanism 71 (shown in Figures 4 and 6), an actuator interlock 21 (shown in Figures 5-7), and a hook mechanism 25 (shown in Figures 6 and 7).
In the preferred embodiment, the plunger mechanism 71 of the interlock mechanism 20 is used to prevent the closure of a switch (in the exemplary emhodiment, switch 50) if the door 60 of the cabinet 10 is open. The operation and configuration of this aspect of the interlock mechanism 20 is described with 30 reference to Figures 4 and 6. In particular, this aspect or interlocking feature of the invention uses the plunger 71 and a slotted cam 23 coupled to the actuator 22 of the switch 50.
The plunger 71 engages a slot 24 of the cam 23 when door 60 is open and the switch 50 is also open, thus preventing the 35 rotation of the actuator 22. As a ccnsequence, the switch 50 cannot be closed when the door 60 is open. In the preferred embodiment of the invention, when the door 60 of the cabinet 10 21331'~2 is closed, the plunger 71 is depressed by the door 60 and disengaged from the slot 24 of the cam 23 thus allowing actuation of the switch So. Figures 4 and 6 show a preferred configuration of the plunger 71 and cam 23.
S In particular, as shown in Figure 4, the plunger 71 is mounted in the interlock mechanism 20 and rests against a support 76 of the mechanism 20. The plunger 71 is coupled to a plunger spring 72, a washer 73, and ~ spring pin 74. In the preferred embodiment, the plunger spring 72, washer 73, and 10 spring pin 74 are configured so that the rear extension of the plunger 71 facing into the cabinet lO rests against the support 76 unless pressure is applied against the front extension 75 of the plunger 71.
As best shown in Figure 4, if pressure is applied to 15 the front extension 75 of the plun~er 71 in a direction toward the rear of the cabinet 10, the plunger 71 will extend further to the rear of the cabinet and thus will not rest against the support 76 and will not engage the slot 24. When the door 60 of the cabinet is closed, the door applies such a pressure to 20 the front extension 75 of the plunger 71. If the door is open, however, the spring 72 will force the plunger 71 to rest against the support 76.
The plunger 71 is shown in Figure 6 in relation to the cam 23 of the actuator 22 of the switch 50. As shown, the cam 23 is directly coupled to the actuator 22 so that when the cam 23 is prevented from moving by the plunger 71 engaging the slot 24, the actuator 22 is also prevented from moving and thus the switch 50 is prevented from ~eing actuated. In Figure 6, the cam 23 and the actuator ^~2 are shown in the position 30 corresponding to the open posi.tion of the switch 50. When the door 60 is alsc open, the slot 24 of the cam 23 engages the rear extension of the plunger 71.
Referring again to Figure 4, in the preferred embodiment, the thickness of the cam 23 and configura'ion of 35 the rear extension cf the plunger 71 are selected so that when the door is closed the plunger 71 will not engage the slot 24 of the cam 23. Thus, when the door 60 is closed, the actuator A~PD-0002/B930040 -- 9 -- PATENT
22 may be rotated to close the switch 50. However, as explained above, the plunger 71 and the slot 24 in the cam 23 prevent closure of the switch 50 when the door 60 is open.
As noted above, the interlock mechanism 20 also 5 prevents the opening of the door 60 when the switch 50 is closed. In the preferred embodiment, a hooked cam 23 (Figure 7) and a hasp 61 on the door 60 (Figure 8) are used to prevent the opening of the door 60 when the switch 50 is closed. The operation and configuration of this aspect of the interlock 10 mechanism 20 is described with reference to Figures 5 to 8. In the preferred embodiment, a hook 25 in the cam 23 engages a slot 63 (Figure 8) of the hasp 61 of the door 60 when the switch 50 is closed, thus preventing the opening of the door 60. When the actuator 22 is moved to the position 15 corresponding to the open position of the switch 50, the hook 25 of the cam 23 disengagPs the slot 63 of the hasp 61 so that the door 60 may be opened. As shown in Figures 6 and 7, the hasp 61 of the door 60 enters the interlock mechanism 20 of the switch operator through a slot 26 in the mechanism 20. As 20 shown in Figure 8, the hasp 61 preferably has a rectangular slot 63 that the hook 25 of the cam 23 engages when the switch is closed. Thus, in the preferred embodiment, the door 60 of the cabinet 10 is prevented from being opened by the engagement of the hook 25 to the slot 63.
To summarize, during a cycle of opening and closing the switch 50, the components of the interlock mechanism 20, in particular, the plunger 71, the hook 25 and the slot 24 of the cam 23, and the hasp 61, interact to: (i) prevent closure of the switch 50 when the door 60 ~s open; and, (ii) prevent the 30 door 60 from being opened when the switch 50 is closed. For example, if the door 60 is closed and the switch 50 is closed, the hook 25 will engage the slot 63 of the hasp 61 and the front extension 75 of the plunger 71 will be depressed rearward so that the rear extension of the plunger 71 will not rest 35 against the support 76 and tnerefore will not engage the slot 24. In this situation, the door 60 is prevented from being opened, but the switch 5G can be actuated since the plunger 71 is not engaged with the slot 24. Thus, a clockwise rotational force may be applied by the handle 90 of the actuator 22, causing the switch 50 to be opened.
As the actuator 22 is being rotated clockwise, the 5 hook 25 will also be rotated clockwise and will reach a point where the switch 50 is open. At this point, the hook 25 will no longer engage the slot of the hasp 61 as shown in Figure 6.
As a consequence, at this point, the door 60 may be opened.
When the door 60 is opened, the rear extension of the plunger 10 71 will engage the slot 24 as shown in Figure 6. Thus, the door 60 and the switch 50 will be open. Due to the engagement of the rear extension of the plunger 71 with the slot 24, the actuator 22 will not be able to be rotated counterclockwise.
Thus, the switch 50 can not be closed when the door 60 is open.
15 The actuator 22 can only be rotated to the closed position when the door 60 of the cabinet 10 is closed. As explained above, when the door 60 is closed, the door 60 depresses the front extension 75 of the plunger 71 and disengages the rear extension of the plunger 71 with the slot 24. With the rear 20 extension of the plunger 71 disengaged with the slot 24, the actuator 22 may be rotated to close the switch 50.
Finally, in addition to the two functions described above, the interlock mechanism 20 also prevents the actuation of switch 40 when the switch 50 is closed. Such a function is 25 particularly useful in electrical switch gear, e.g., cabinet 10, that include both an interrupter switch and a line selector switch. However, this third function of the interlock mechanism 20 of the present invention may be used in any application in which it is desirable to control the actuation 30 of one switch depending upon the position, or state, of another switch. According to the preferred embodiment, the cam 23 and an actuator interlock (sliding plate) 21 are used to prevent the actuation of switch 40 when the switch 50 is closed. The operation and configuration of this aspect of the interlock 35 mechanism 20 are described with reference to Figures 5 to 7.
In the preferred embodiment, as shown in Figure 5, the cam 23 of the actuator 22 engages with an extension 33 of the sliding , 21~3122 A~PD-0002/B930040 - 11 - PATENT
plate or actuator interlock 21. When the switch 50 is closed, as shown in Figure 7, the cam 23 engages the extension 33 and causes an opening 28 of the actuator interlock 21 to engage the actuator 29. This engagement of the actuator 29 prevents its 5 rotation and consequently the actuation of the switch 40 when the switch 50 is closed.
In greater detail, when the switch 50 is closed, the cam 23 of the actuator 22 engages the extension 33 of the actuator interlock 21 which raises the position of the actuator interlock 21. This engagement causes the actuator interlock 21 to reach it highest position relative to the actuators 22 and 29. As show in Figure 6, in the preferred embodiment of the invention, the actuator interlock 21 is a sliding plate 21 which slides up and down on two slots 37 and 38 as a function 15 of the position of the cam 23. In the preferred embodiment, the interlock 21 inclu~es an opening 27 around the actuator 29 for the switch 40. Preferably, the shape of the opening 27 is such that when the interlock 21 is at its lowest point, as shown in Figure 6, (which point corresponds to the position of 20 the cam 23 when the switch 50 is open), the actuator 29 is in the circular portion of the opening 27 and thus the actuator 29 of the switch 40 may be rotated to actuate the switch 40. When the actuator interloc~ 21 is in its highest position, as shown in Figure 7, (which point corresponds to the position of the 25 cam 23 when the switch 50 is closed), the actuator 29 is in the square portion 28 of the opening 27 and thus the actuator 29 of the line selector switch 40 may not be rotated to actuate the switch 40. Thus, the actuator interlock 21 prevents the actuation of the switch 40 when the switch 50 is closed, but 30 permits the actuati.on of the switch 40 when the switch 50 is open.
As the foregoing illustrates, therefore, in the exemplary electrical cabinet 10, the interlock mechanism 20 of the present invention is employed to: (i) prevent closure of the switch 50 as a function of the position of the door 60;
(ii) prevent opening of the door 60 as a function of the A~PD-0002/B930040 - 12 - PATENT
position of the switch 50; and (iii) prevent actuation of the switch 40 as a function of the position of switch 50.
From the foregoing it can be seen that the present invention is directed first to a switch operator which uses a flexible shaft to overcome the disadvantages of known switch operators, and secondly, to an interlock mechanism that prevents the actuation of one or more switches in certain situations and also prevents the opening of a door based on the position of one or more of these switches. It is understood 10 that changes may be made to the embodiments described above without departing from the broad inventive concepts thereof.
For example, the switch operator and ~nterlock mechanism of the present invention may be employed in electrical cabinets that contain only one switch, or alterna~ively, in electrical 15 cabinets that contain more than two switches. Accordingly, this invention is not limited to the particular embodiments disclosed, but is intended to cover all modifications that are within the scope and spirit of the invention as defined by the appended claims.
Claims (20)
1. A switch operator for actuating a switch, said switch operator comprising:
an actuator;
a drive means coupled to said switch for actuating said switch in response to a rotational force applied to said drive means; and a flexible shaft coupling said actuator to said drive means, said flexible shaft communicating rotational motion of said actuator to said drive means.
an actuator;
a drive means coupled to said switch for actuating said switch in response to a rotational force applied to said drive means; and a flexible shaft coupling said actuator to said drive means, said flexible shaft communicating rotational motion of said actuator to said drive means.
2. A switch operator according to claim 1, wherein said switch is one of an interrupter switch and a line selector switch.
3. A switch operator according to claim 1, wherein said drive means comprises a bevel gear drive.
4. A switch operator according to claim 3, wherein said flexible shaft is a flexible steel shaft.
5. An electrical switch cabinet having first and second switches and first and second switch operators for respectively actuating said first and second switches, said first switch operator comprising:
a first actuator;
a first drive means coupled to said first switch for actuating said first switch in response to a rotational force applied to said first drive means; and a first flexible shaft coupling said first actuator to said first drive means, said first shaft communicating rotational motion of said first actuator to said first drive means; and said second switch operator comprising:
a second actuator;
a second drive means coupled to said second switch for actuating said second switch in response to a rotational force applied to said second drive means; and a second flexible shaft coupling said second actuator to said second drive means, said second shaft communicating rotational motion of said second actuator to said second drive means.
a first actuator;
a first drive means coupled to said first switch for actuating said first switch in response to a rotational force applied to said first drive means; and a first flexible shaft coupling said first actuator to said first drive means, said first shaft communicating rotational motion of said first actuator to said first drive means; and said second switch operator comprising:
a second actuator;
a second drive means coupled to said second switch for actuating said second switch in response to a rotational force applied to said second drive means; and a second flexible shaft coupling said second actuator to said second drive means, said second shaft communicating rotational motion of said second actuator to said second drive means.
6. An electrical switch cabinet according to claim 5, wherein said first switch is an interrupter switch and said second switch is a line selector switch.
7. An electrical switch cabinet according to claim 5, wherein at least one of said first drive means and said second drive means comprises a bevel gear drive.
8. An electrical switch cabinet according to claim 7, wherein said first flexible shaft and said second flexible shaft are flexible steel shafts.
9. An electrical switch cabinet according to claim 5, further comprising an interlock mechanism having switch interlock means for preventing the actuation of said second switch as a function of the position of said first switch.
10. An electrical switch cabinet according to claim 9, wherein said cabinet has a door and said interlock mechanism further comprises prevention means for preventing the opening of said door as a function of the position of said first switch.
11. An electrical switch cabinet according to claim 10, said wherein interlock mechanism still further comprises actuation means for preventing the actuation of said first switch as a function of the position of said door.
12. An electrical switch cabinet according to claim 11, wherein said door has a hasp and said prevention means comprises a cam having a hook for engaging the hasp of said door, the hook being adapted to engage the hasp of said door when said first switch is in a first position, but to disengage the hasp when said switch is in a second position.
13. An electrical switch cabinet according to claim 12, wherein said switch interlock means includes a plate extending from an actuator for said second switch to a cam coupled to an actuator for said first switch, said plate is adapted so that when the first switch actuator is in a first position, the cam forces the plate into engagement with the second actuator thereby preventing the second actuator from moving.
14. An interlock mechanism for an electrical cabinet having first and second switches and a door, said interlock mechanism comprising:
switch interlock means for preventing the actuation of said second switch as a function of said first switch; and prevention means for preventing the opening of said door as a function of the position of said first switch.
switch interlock means for preventing the actuation of said second switch as a function of said first switch; and prevention means for preventing the opening of said door as a function of the position of said first switch.
15. An interlock mechanism according to claim 14, wherein said switch interlock means includes a plate extending from an actuator for said second switch to a cam coupled to an actuator for said first switch, said plate is adapted so that when the first switch actuator is in a first position, the cam forces the plate into engagement with the second actuator thereby preventing the second actuator from moving.
16. An interlock mechanism according to claim 14, further comprising actuation means for preventing the actuation of said first switch as a function of the position of said door.
17. An interlock mechanism according to claim 14, wherein said door has a hasp and wherein said prevention means comprises a cam having a hook for engaging the hasp of said door, the hook being adapted to engage the hasp of said door when said first switch is in a first position, but to disengage the hasp when said switch is in a second position.
18. An interlock mechanism according to claim 17, wherein said cam has a slot and wherein said interlock mechanism further comprises:
a plunger having a spring and a first extension for engaging the slot of said cam as a function of the position of said first switch, and a second extension for engaging said door as a function of the position of the door.
a plunger having a spring and a first extension for engaging the slot of said cam as a function of the position of said first switch, and a second extension for engaging said door as a function of the position of the door.
19. An interlock mechanism according to claim 18, wherein the first extension of said plunger is adapted to engage the slot of said cam when said first switch is open and said door is open, and the second extension of said plunger is adapted to be pressed by said door when said door is closed so that when said door is closed the first extension does not engage the slot of said cam and so that when said door is open and said first switch is open the first extension engages the slot of said cam.
20. An interlock mechanism according to claim 19, wherein said switch interlock means includes a plate extending from an actuator for said second switch to a cam coupled to an actuator for said first switch and said plate is configured to engage and prevent the rotation of said actuator for said second switch as a function of the position of said first switch.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US157,385 | 1993-11-23 | ||
| US08/157,385 US5466902A (en) | 1993-11-23 | 1993-11-23 | Switch operator and interlock mechanism |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2133122A1 true CA2133122A1 (en) | 1995-05-24 |
Family
ID=22563495
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002133122A Abandoned CA2133122A1 (en) | 1993-11-23 | 1994-09-28 | Switch operator and interlock mechanism |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US5466902A (en) |
| CA (1) | CA2133122A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2909851A2 (en) * | 2012-10-22 | 2015-08-26 | Abb Ag | Rotationally actuated switching arrangement for a switch assembly |
Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT1289481B1 (en) * | 1996-12-20 | 1998-10-15 | Sace Spa | SERIES OF SWITCHES WITH MUTUAL LOCKING MEANS |
| CN1268050C (en) * | 2001-04-23 | 2006-08-02 | 西门子公司 | Electric switch with a drive shaft and a blocking mechanism for blocking actuation of the drive shaft |
| DE10120784C1 (en) * | 2001-04-23 | 2002-07-11 | Siemens Ag | Travel drive for plug-in load switch has hand crank with hollow shaft fitted to drive shaft to allow relative axial movement into operating position |
| US6710697B1 (en) * | 2002-11-18 | 2004-03-23 | Rockwell Automation Technologies, Inc. | Flexible cable operated fuse switch |
| US20100130121A1 (en) * | 2008-11-26 | 2010-05-27 | Ming-Tsung Chiu | Air intake switching device for portable air conditioner |
| US20100110616A1 (en) * | 2010-01-04 | 2010-05-06 | Edel Thomas G | Disconnect switch with overcurrent device and enclosure for reduced hazard |
| EP2551886B1 (en) | 2011-07-28 | 2014-11-26 | ABB Technology AG | Switch device with a switching element driven using a flexible shaft |
| CN103093986B (en) * | 2012-12-11 | 2015-08-05 | 中煤张家口煤矿机械有限责任公司 | The mechanical lock of anti-explosion is electromagnetic starter |
| US8927887B2 (en) | 2013-01-08 | 2015-01-06 | Eaton Corporation | Variable depth circuit interrupter assembly with interlock |
| GB2521135B (en) * | 2013-12-10 | 2017-01-18 | Tavrida Electric Holding Ag | Switching apparatus for electrical power systems |
| FR3038465A1 (en) * | 2015-07-02 | 2017-01-06 | Alstom Technology Ltd | CONTROL OF HIGH VOLTAGE EQUIPMENT INCLUDED IN A METALLIC ENCLOSURE ELECTRICAL STATION |
| CN106451113B (en) * | 2016-11-17 | 2018-11-27 | 湖南平高开关有限公司 | Inflatable switch cabinet and its cabinet door locking and unlocking method |
| KR101960058B1 (en) * | 2018-05-31 | 2019-07-15 | 현대일렉트릭앤에너지시스템(주) | Remote operating structure for separating auxiliary contact from driving unit in gas insulated switchgear |
| CN112509858B (en) * | 2020-12-21 | 2021-10-19 | 西安交通大学 | Double-break interlocking quick switch for integrated series compensation current limiting device |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3881076A (en) * | 1974-04-12 | 1975-04-29 | Ford Motor Co | Steering column vehicle switch assembly having rotary and lineal movement |
| US4034170A (en) * | 1976-01-21 | 1977-07-05 | General Electric Company | Electrical transfer switching apparatus having door interlock and plural switch interlock |
| US4107486A (en) * | 1976-06-30 | 1978-08-15 | S & C Electric Company | Switch operating mechanisms for high voltage switches |
| US4295054A (en) * | 1979-10-23 | 1981-10-13 | Westinghouse Electric Corp. | Electric control system with rotary mechanical interlock and timing mechanism |
| US4405844A (en) * | 1982-04-01 | 1983-09-20 | S&C Electric Company | Door interlock for electrical apparatus |
-
1993
- 1993-11-23 US US08/157,385 patent/US5466902A/en not_active Expired - Lifetime
-
1994
- 1994-09-28 CA CA002133122A patent/CA2133122A1/en not_active Abandoned
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2909851A2 (en) * | 2012-10-22 | 2015-08-26 | Abb Ag | Rotationally actuated switching arrangement for a switch assembly |
Also Published As
| Publication number | Publication date |
|---|---|
| US5466902A (en) | 1995-11-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |